[RFA/ARM] Framificate the ARM port [2/3]

[Andrew Cagney]

> The second of three patches.  The last of the boring ones.
> 
> This patch changes ARM to build an entire cache before setting any
> information in the frame.  It includes some nasty hacks (for instance,
> at one point it calls deprecated_get_next_frame_hack to get the sentinel
> frame); don't worry, I swear they'll all go away in patch #3.

So it's useful!  Looking at the first patch, and arm_get_cache, perhaphs 
there should also be a:

	void **deprecated_get_this_frame_cache (next_frame);

method.

Andrew